Dispirofluorene–Indenofluorene Derivatives as New Building Blocks for Blue Organic Electroluminescent Devices and Electroactive Polymers

TLDR

The new dispirofluorene–indenofluorene building blocks combine indenofluorene and spirobifluorene properties for blue‑light‑emitting devices and electroactive polymers. The study reports synthetic investigations of these structures and their thermal, structural, photophysical, and electrochemical properties. The authors synthesized the DSF‑IFs and characterized their thermal, structural, photophysical, and electrochemical properties. The DSF‑IFs were synthesized and found to have thermal, structural, photophysical and electrochemical properties comparable to IF and SBF, undergo anodic oxidation to form non‑soluble transparent 3‑D polymers whose structural and electrochemical behavior was characterized, and were successfully applied as blue‑light emitters in OLEDs.

Abstract

A series of new dispiro[fluorene-9',6,9'',12-indeno[1,2b]fluorenes] (DSF-IFs) has been synthesised. These new building blocks for blue-light-emitting devices and electroactive polymers combine indenofluorene (IF) and spirobifluorene (SBF) properties. We report here our synthetic investigations towards these new structures and their thermal, structural, photophysical and electrochemical properties. These properties have been compared to those of IF and SBF. We also report the anodic oxidation of DSF-IFs that leads to the formation of non-soluble transparent three-dimensional polymers. The structural and electrochemical behaviour of these polymers has been studied. The first application of these building blocks as new blue-light-emitting materials in organic light-emitting diodes (OLED) is also reported.